Frequency domain resource allocation for frequency division multiplexing schemes with single downlink control information associated with multiple transmission configuration indication states

ABSTRACT

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a downlink control information (DCI) message that includes a frequency domain resource allocation field to indicate allocated resource blocks (RBs) across multiple transmission configuration indication (TCI) states. The UE may identify, based at least in part on the DCI message and/or a radio resource control configuration, at least one parameter that indicates a unit of contiguous RBs over which the same precoding is used and/or a resource allocation type. The UE may assign the allocated RBs to individual TCI states among the multiple TCI states based at least in part on the unit of contiguous RBs over which the same precoding is used and/or the resource allocation type. Numerous other aspects are provided.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. patent application Ser. No.16/803,732, filed Feb. 27, 2020, entitled “FREQUENCY DOMAIN RESOURCEALLOCATION FOR FREQUENCY DIVISION MULTIPLEXING SCHEMES WITH SINGLEDOWNLINK CONTROL INFORMATION ASSOCIATED WITH MULTIPLE TRANSMISSIONCONFIGURATION INDICATION STATES”, which claims priority to U.S.Provisional Application No. 62/865,730, filed on Jun. 24, 2019, entitled“FREQUENCY DOMAIN RESOURCE ALLOCATION FOR FREQUENCY DIVISIONMULTIPLEXING SCHEMES WITH SINGLE DOWNLINK CONTROL INFORMATION ASSOCIATEDWITH MULTIPLE TRANSMISSION CONFIGURATION INDICATION STATES,” which arehereby expressly incorporated by reference herein.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wirelesscommunication and to techniques and apparatuses for assigning afrequency domain resource allocation (FDRA) indicated in a singledownlink control information (DCI) message to multiple transmissionconfiguration indication (TCI) states.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, and/or the like). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency-division multipleaccess (FDMA) systems, orthogonal frequency-division multiple access(OFDMA) systems, single-carrier frequency-division multiple access(SC-FDMA) systems, time division synchronous code division multipleaccess (TD-SCDMA) systems, and Long Term Evolution (LTE).LTE/LTE-Advanced is a set of enhancements to the Universal MobileTelecommunications System (UMTS) mobile standard promulgated by theThird Generation Partnership Project (3GPP).

A wireless communication network may include a number of base stations(BSs) that can support communication for a number of user equipment(UEs). A user equipment (UE) may communicate with a base station (BS)via the downlink and uplink. The downlink (or forward link) refers tothe communication link from the BS to the UE, and the uplink (or reverselink) refers to the communication link from the UE to the BS. As will bedescribed in more detail herein, a BS may be referred to as a Node B, agNB, an access point (AP), a radio head, a transmit receive point (TRP),a New Radio (NR) BS, a 5G Node B, and/or the like.

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent user equipment to communicate on a municipal, national,regional, and even global level. New Radio (NR), which may also bereferred to as 5G, is a set of enhancements to the LTE mobile standardpromulgated by the Third Generation Partnership Project (3GPP). NR isdesigned to better support mobile broadband Internet access by improvingspectral efficiency, lowering costs, improving services, making use ofnew spectrum, and better integrating with other open standards usingorthogonal frequency division multiplexing (OFDM) with a cyclic prefix(CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g.,also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) onthe uplink (UL), as well as supporting beamforming, multiple-inputmultiple-output (MIMO) antenna technology, and carrier aggregation.However, as the demand for mobile broadband access continues toincrease, there exists a need for further improvements in LTE and NRtechnologies. Preferably, these improvements should be applicable toother multiple access technologies and the telecommunication standardsthat employ these technologies.

SUMMARY

In some aspects, a method of wireless communication, performed by a userequipment (UE), may include: receiving a downlink control information(DCI) message that includes a frequency domain resource allocation(FDRA) field to indicate allocated resource blocks (RBs) across multipletransmission configuration indication (TCI) states; identifying, basedat least in part on one or more of the DCI message or a radio resourcecontrol (RRC) configuration, at least one parameter that indicates aunit of contiguous RBs over which the same precoding is used, whereinthe at least one parameter includes one or more of a precoding RB group(PRG) size or a physical RB (PRB) bundle size; and assigning theallocated RBs to individual TCI states among the multiple TCI statesbased at least in part on the at least one parameter that indicates theunit of contiguous RBs over which the same precoding is used.

In some aspects, a UE for wireless communication may include a memoryand one or more processors operatively coupled to the memory. The memoryand the one or more processors may be configured to: receive a DCImessage that includes an FDRA field to indicate allocated RBs acrossmultiple TCI states; identify, based at least in part on one or more ofthe DCI message or an RRC configuration, at least one parameter thatindicates a unit of contiguous RBs over which the same precoding isused, wherein the at least one parameter includes one or more of a PRGsize or a PRB bundle size; and assign the allocated RBs to individualTCI states among the multiple TCI states based at least in part on theat least one parameter that indicates the unit of contiguous RBs overwhich the same precoding is used.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a UE, may causethe one or more processors to: receive a DCI message that includes anFDRA field to indicate allocated RBs across multiple TCI states;identify, based at least in part on one or more of the DCI message or anRRC configuration, at least one parameter that indicates a unit ofcontiguous RBs over which the same precoding is used, wherein the atleast one parameter includes one or more of a PRG size or a PRB bundlesize; and assign the allocated RBs to individual TCI states among themultiple TCI states based at least in part on the at least one parameterthat indicates the unit of contiguous RBs over which the same precodingis used.

In some aspects, an apparatus for wireless communication may include:means for receiving a DCI message that includes an FDRA field toindicate allocated RBs across multiple TCI states; means foridentifying, based at least in part on one or more of the DCI message oran RRC configuration, at least one parameter that indicates a unit ofcontiguous RBs over which the same precoding is used, wherein the atleast one parameter includes one or more of a PRG size or a PRB bundlesize; and means for assigning the allocated RBs to individual TCI statesamong the multiple TCI states based at least in part on the at least oneparameter that indicates the unit of contiguous RBs over which the sameprecoding is used.

In some aspects, a method of wireless communication, performed by a UE,may include: receiving a DCI message that includes an FDRA field toindicate allocated RBs across multiple TCI states; identifying, based atleast in part on one or more of the DCI message or an RRC configuration,at least one parameter that indicates a resource allocation type; andassigning the allocated RBs to individual TCI states among the multipleTCI states based at least in part on the resource allocation type.

In some aspects, a UE for wireless communication may include a memoryand one or more processors operatively coupled to the memory. The memoryand the one or more processors may be configured to: receive a DCImessage that includes an FDRA field to indicate allocated RBs acrossmultiple TCI states; identify, based at least in part on one or more ofthe DCI message or an RRC configuration, at least one parameter thatindicates a resource allocation type; and assign the allocated RBs toindividual TCI states among the multiple TCI states based at least inpart on the resource allocation type.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a UE, may causethe one or more processors to: receive a DCI message that includes aFDRA field to indicate allocated RBs across multiple TCI states;identify, based at least in part on one or more of the DCI message or anRRC configuration, at least one parameter that indicates a resourceallocation type; and assign the allocated RBs to individual TCI statesamong the multiple TCI states based at least in part on the resourceallocation type.

In some aspects, an apparatus for wireless communication may include:means for receiving a DCI message that includes an FDRA field toindicate allocated RBs across multiple TCI states; means foridentifying, based at least in part on one or more of the DCI message oran RRC configuration, at least one parameter that indicates a resourceallocation type; and means for assigning the allocated RBs to individualTCI states among the multiple TCI states based at least in part on theresource allocation type.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, transmit receive point, wireless communication device, and/orprocessing system as substantially described herein with reference toand as illustrated by the accompanying drawings and specification.

The foregoing has outlined rather broadly the features and technicaladvantages of examples according to the disclosure in order that thedetailed description that follows may be better understood. Additionalfeatures and advantages will be described hereinafter. The conceptionand specific examples disclosed may be readily utilized as a basis formodifying or designing other structures for carrying out the samepurposes of the present disclosure. Such equivalent constructions do notdepart from the scope of the appended claims. Characteristics of theconcepts disclosed herein, both their organization and method ofoperation, together with associated advantages will be better understoodfrom the following description when considered in connection with theaccompanying figures. Each of the figures is provided for the purposesof illustration and description, and not as a definition of the limitsof the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can beunderstood in detail, a more particular description, briefly summarizedabove, may be had by reference to aspects, some of which are illustratedin the appended drawings. It is to be noted, however, that the appendeddrawings illustrate only certain typical aspects of this disclosure andare therefore not to be considered limiting of its scope, for thedescription may admit to other equally effective aspects. The samereference numbers in different drawings may identify the same or similarelements.

FIG. 1 is a block diagram conceptually illustrating an example of awireless communication network, in accordance with various aspects ofthe present disclosure.

FIG. 2 is a block diagram conceptually illustrating an example of a basestation in communication with a user equipment (UE) in a wirelesscommunication network, in accordance with various aspects of the presentdisclosure.

FIG. 3A is a block diagram conceptually illustrating an example of aframe structure in a wireless communication network, in accordance withvarious aspects of the present disclosure.

FIG. 3B is a block diagram conceptually illustrating an examplesynchronization communication hierarchy in a wireless communicationnetwork, in accordance with various aspects of the present disclosure.

FIG. 4 is a block diagram conceptually illustrating an example slotformat with a normal cyclic prefix, in accordance with various aspectsof the present disclosure.

FIG. 5 illustrates an example logical architecture of a distributedradio access network (RAN), in accordance with various aspects of thepresent disclosure.

FIG. 6 illustrates an example physical architecture of a distributedRAN, in accordance with various aspects of the present disclosure.

FIG. 7 is a diagram illustrating an example of a multi-transmit receivepoint (TRP) communication with single downlink control information(DCI), in accordance with various aspects of the present disclosure.

FIG. 8 is a diagram illustrating an example of a frequency domainresource allocation (FDRA), in accordance with various aspects of thepresent disclosure.

FIGS. 9A-9B are diagrams illustrating an example of a multi-TRPcommunication in which a UE assigns an allocated FDRA indicated in asingle DCI message to different transmission configuration indication(TCI) states based on a size associated with a precoding resource blockgroup (PRG) and/or a physical resource block (PRB) bundle, in accordancewith various aspects of the present disclosure.

FIGS. 10A-10E are diagrams illustrating an example of a multi-TRPcommunication in which a UE assigns an allocated FDRA indicated in asingle DCI message to different TCI states based on a resourceallocation type, in accordance with various aspects of the presentdisclosure.

FIGS. 11-12 are diagrams illustrating example processes performed, forexample, by a UE, in accordance with various aspects of the presentdisclosure.

DETAILED DESCRIPTION

Various aspects of the disclosure are described more fully hereinafterwith reference to the accompanying drawings. This disclosure may,however, be embodied in many different forms and should not be construedas limited to any specific structure or function presented throughoutthis disclosure. Rather, these aspects are provided so that thisdisclosure will be thorough and complete, and will fully convey thescope of the disclosure to those skilled in the art. Based on theteachings herein one skilled in the art should appreciate that the scopeof the disclosure is intended to cover any aspect of the disclosuredisclosed herein, whether implemented independently of or combined withany other aspect of the disclosure. For example, an apparatus may beimplemented or a method may be practiced using any number of the aspectsset forth herein. In addition, the scope of the disclosure is intendedto cover such an apparatus or method which is practiced using otherstructure, functionality, or structure and functionality in addition toor other than the various aspects of the disclosure set forth herein. Itshould be understood that any aspect of the disclosure disclosed hereinmay be embodied by one or more elements of a claim.

Several aspects of telecommunication systems will now be presented withreference to various apparatuses and techniques. These apparatuses andtechniques will be described in the following detailed description andillustrated in the accompanying drawings by various blocks, modules,components, circuits, steps, processes, algorithms, and/or the like(collectively referred to as “elements”). These elements may beimplemented using hardware, software, or combinations thereof. Whethersuch elements are implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem.

It should be noted that while aspects may be described herein usingterminology commonly associated with 3G and/or 4G wireless technologies,aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

FIG. 1 is a diagram illustrating a wireless network 100 in which aspectsof the present disclosure may be practiced. The wireless network 100 maybe an LTE network or some other wireless network, such as a 5G or NRnetwork. The wireless network 100 may include a number of BSs 110 (shownas BS 110 a, BS 110 b, BS 110 c, and BS 110 d) and other networkentities. A BS is an entity that communicates with user equipment (UEs)and may also be referred to as a base station, a NR BS, a Node B, a gNB,a 5G node B (NB), an access point, a transmit receive point (TRP),and/or the like. Each BS may provide communication coverage for aparticular geographic area. In 3GPP, the term “cell” can refer to acoverage area of a BS and/or a BS subsystem serving this coverage area,depending on the context in which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or another type of cell. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having association with the femto cell (e.g.,UEs in a closed subscriber group (CSG)). A BS for a macro cell may bereferred to as a macro BS. A BS for a pico cell may be referred to as apico BS. A BS for a femto cell may be referred to as a femto BS or ahome BS. In the example shown in FIG. 1 , a BS 110 a may be a macro BSfor a macro cell 102 a, a BS 110 b may be a pico BS for a pico cell 102b, and a BS 110 c may be a femto BS for a femto cell 102 c. A BS maysupport one or multiple (e.g., three) cells. The terms “eNB”, “basestation”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” maybe used interchangeably herein.

In some aspects, a cell may not necessarily be stationary, and thegeographic area of the cell may move according to the location of amobile BS. In some aspects, the BSs may be interconnected to one anotherand/or to one or more other BSs or network nodes (not shown) in thewireless network 100 through various types of backhaul interfaces suchas a direct physical connection, a virtual network, and/or the likeusing any suitable transport network.

Wireless network 100 may also include relay stations. A relay station isan entity that can receive a transmission of data from an upstreamstation (e.g., a BS or a UE) and send a transmission of the data to adownstream station (e.g., a UE or a BS). A relay station may also be aUE that can relay transmissions for other UEs. In the example shown inFIG. 1 , a relay station 110 d may communicate with macro BS 110 a and aUE 120 d in order to facilitate communication between BS 110 a and UE120 d. A relay station may also be referred to as a relay BS, a relaybase station, a relay, and/or the like.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/orthe like. These different types of BSs may have different transmit powerlevels, different coverage areas, and different impacts on interferencein wireless network 100. For example, macro BSs may have a high transmitpower level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relayBSs may have lower transmit power levels (e.g., 0.1 to 2 Watts).

A network controller 130 may couple to a set of BSs and may providecoordination and control for these BSs. Network controller 130 maycommunicate with the BSs via a backhaul. The BSs may also communicatewith one another, e.g., directly or indirectly via a wireless orwireline backhaul.

UEs 120 (e.g., 120 a, 120 b, 120 c) may be dispersed throughout wirelessnetwork 100, and each UE may be stationary or mobile. A UE may also bereferred to as an access terminal, a terminal, a mobile station, asubscriber unit, a station, and/or the like. A UE may be a cellularphone (e.g., a smart phone), a personal digital assistant (PDA), awireless modem, a wireless communication device, a handheld device, alaptop computer, a cordless phone, a wireless local loop (WLL) station,a tablet, a camera, a gaming device, a netbook, a smartbook, anultrabook, a medical device or equipment, biometric sensors/devices,wearable devices (smart watches, smart clothing, smart glasses, smartwrist bands, smart jewelry (e.g., smart ring, smart bracelet)), anentertainment device (e.g., a music or video device, or a satelliteradio), a vehicular component or sensor, smart meters/sensors,industrial manufacturing equipment, a global positioning system device,or any other suitable device that is configured to communicate via awireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolvedor enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEsinclude, for example, robots, drones, remote devices, sensors, meters,monitors, location tags, and/or the like, that may communicate with abase station, another device (e.g., remote device), or some otherentity. A wireless node may provide, for example, connectivity for or toa network (e.g., a wide area network such as Internet or a cellularnetwork) via a wired or wireless communication link. Some UEs may beconsidered Internet-of-Things (IoT) devices, and/or may be implementedas NB-IoT (narrowband internet of things) devices. Some UEs may beconsidered a Customer Premises Equipment (CPE). UE 120 may be includedinside a housing that houses components of UE 120, such as processorcomponents, memory components, and/or the like.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular RAT andmay operate on one or more frequencies. A RAT may also be referred to asa radio technology, an air interface, and/or the like. A frequency mayalso be referred to as a carrier, a frequency channel, and/or the like.Each frequency may support a single RAT in a given geographic area inorder to avoid interference between wireless networks of different RATs.In some cases, NR or 5G RAT networks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120 a and UE 120e) may communicate directly using one or more sidelink channels (e.g.,without using a base station 110 as an intermediary to communicate withone another). For example, the UEs 120 may communicate usingpeer-to-peer (P2P) communications, device-to-device (D2D)communications, a vehicle-to-everything (V2X) protocol (e.g., which mayinclude a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure(V2I) protocol, and/or the like), a mesh network, and/or the like. Inthis case, the UE 120 may perform scheduling operations, resourceselection operations, and/or other operations described elsewhere hereinas being performed by the base station 110.

As indicated above, FIG. 1 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 1 .

FIG. 2 shows a block diagram of a design 200 of base station 110 and UE120, which may be one of the base stations and one of the UEs in FIG. 1. Base station 110 may be equipped with T antennas 234 a through 234 t,and UE 120 may be equipped with R antennas 252 a through 252 r, where ingeneral T≥1 and R≥1.

At base station 110, a transmit processor 220 may receive data from adata source 212 for one or more UEs, select one or more modulation andcoding schemes (MCS) for each UE based at least in part on channelquality indicators (CQIs) received from the UE, process (e.g., encodeand modulate) the data for each UE based at least in part on the MCS(s)selected for the UE, and provide data symbols for all UEs. Transmitprocessor 220 may also process system information (e.g., for semi-staticresource partitioning information (SRPI) and/or the like) and controlinformation (e.g., CQI requests, grants, upper layer signaling, and/orthe like) and provide overhead symbols and control symbols. Transmitprocessor 220 may also generate reference symbols for reference signals(e.g., the cell-specific reference signal (CRS)) and synchronizationsignals (e.g., the primary synchronization signal (PSS) and secondarysynchronization signal (SSS)). A transmit (TX) multiple-inputmultiple-output (MIMO) processor 230 may perform spatial processing(e.g., precoding) on the data symbols, the control symbols, the overheadsymbols, and/or the reference symbols, if applicable, and may provide Toutput symbol streams to T modulators (MODs) 232 a through 232 t. Eachmodulator 232 may process a respective output symbol stream (e.g., forOFDM and/or the like) to obtain an output sample stream. Each modulator232 may further process (e.g., convert to analog, amplify, filter, andupconvert) the output sample stream to obtain a downlink signal. Tdownlink signals from modulators 232 a through 232 t may be transmittedvia T antennas 234 a through 234 t, respectively. According to variousaspects described in more detail below, the synchronization signals canbe generated with location encoding to convey additional information.

At UE 120, antennas 252 a through 252 r may receive the downlink signalsfrom base station 110 and/or other base stations and may providereceived signals to demodulators (DEMODs) 254 a through 254 r,respectively. Each demodulator 254 may condition (e.g., filter, amplify,downconvert, and digitize) a received signal to obtain input samples.Each demodulator 254 may further process the input samples (e.g., forOFDM and/or the like) to obtain received symbols. A MIMO detector 256may obtain received symbols from all R demodulators 254 a through 254 r,perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 258 may process (e.g.,demodulate and decode) the detected symbols, provide decoded data for UE120 to a data sink 260, and provide decoded control information andsystem information to a controller/processor 280. A channel processormay determine reference signal received power (RSRP), received signalstrength indicator (RSSI), reference signal received quality (RSRQ),channel quality indicator (CQI), and/or the like. In some aspects, oneor more components of UE 120 may be included in a housing.

On the uplink, at UE 120, a transmit processor 264 may receive andprocess data from a data source 262 and control information (e.g., forreports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) fromcontroller/processor 280. Transmit processor 264 may also generatereference symbols for one or more reference signals. The symbols fromtransmit processor 264 may be precoded by a TX MIMO processor 266 ifapplicable, further processed by modulators 254 a through 254 r (e.g.,for DFT-s-OFDM, CP-OFDM, and/or the like), and transmitted to basestation 110. At base station 110, the uplink signals from UE 120 andother UEs may be received by antennas 234, processed by demodulators232, detected by a MIMO detector 236 if applicable, and furtherprocessed by a receive processor 238 to obtain decoded data and controlinformation sent by UE 120. Receive processor 238 may provide thedecoded data to a data sink 239 and the decoded control information tocontroller/processor 240. Base station 110 may include communicationunit 244 and communicate to network controller 130 via communicationunit 244. Network controller 130 may include communication unit 294,controller/processor 290, and memory 292.

Controller/processor 240 of base station 110, controller/processor 280of UE 120, and/or any other component(s) of FIG. 2 may perform one ormore techniques associated with a frequency domain resource allocation(FDRA) for frequency division multiplexing (FDM) schemes with singledownlink control information (DCI) associated with multiple transmissionconfiguration indication (TCI) states, as described in more detailelsewhere herein. For example, controller/processor 240 of base station110, controller/processor 280 of UE 120, and/or any other component(s)of FIG. 2 may perform or direct operations of, for example, process 1100of FIG. 11 , process 1200 of FIG. 12 , and/or other processes asdescribed herein. Memories 242 and 282 may store data and program codesfor base station 110 and UE 120, respectively. In some aspects, memory242 and/or memory 282 may comprise a non-transitory computer-readablemedium storing one or more instructions for wireless communication. Forexample, the one or more instructions, when executed by one or moreprocessors of the base station 110 and/or the UE 120, may perform ordirection operations of, for example, process 1100 of FIG. 11 , process1200 of FIG. 12 , and/or other processes as described herein. Ascheduler 246 may schedule UEs for data transmission on the downlinkand/or uplink.

In some aspects, UE 120 may include means for receiving a DCI messagethat includes an FDRA field to indicate allocated resource blocks (RBs)across multiple TCI states, means for identifying, based at least inpart on one or more of the DCI message or a radio resource control (RRC)configuration, at least one parameter that indicates a unit ofcontiguous RBs over which the same precoding is used, means forassigning the allocated RBs to individual TCI states among the multipleTCI states based at least in part on the at least one parameter thatindicates the unit of contiguous RBs over which the same precoding isused, and/or the like. In some aspects, such means may include one ormore components of UE 120 described in connection with FIG. 2 , such ascontroller/processor 280, transmit processor 264, TX MIMO processor 266,MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor258, and/or the like.

Additionally, or alternatively, in some aspects UE 120 may include meansfor receiving a DCI message that includes an FDRA field to indicateallocated RBs across multiple TCI states, means for identifying, basedat least in part on one or more of the DCI message or an RRCconfiguration, at least one parameter that indicates a resourceallocation type, means for assigning the allocated RBs to individual TCIstates among the multiple TCI states based at least in part on theresource allocation type, and/or the like. In some aspects, such meansmay include one or more components of UE 120 described in connectionwith FIG. 2 , such as controller/processor 280, transmit processor 264,TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector256, receive processor 258, and/or the like.

As indicated above, FIG. 2 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 2 .

FIG. 3A shows an example frame structure 300 for frequency divisionduplexing (FDD) in a telecommunications system (e.g., NR). Thetransmission timeline for each of the downlink and uplink may bepartitioned into units of radio frames (sometimes referred to asframes). Each radio frame may have a predetermined duration (e.g., 10milliseconds (ms)) and may be partitioned into a set of Z (Z≥1)subframes (e.g., with indices of 0 through Z−1). Each subframe may havea predetermined duration (e.g., 1 ms) and may include a set of slots(e.g., 2^(m) slots per subframe are shown in FIG. 3A, where m is anumerology used for a transmission, such as 0, 1, 2, 3, 4, and/or thelike). Each slot may include a set of L symbol periods. For example,each slot may include fourteen symbol periods (e.g., as shown in FIG.3A), seven symbol periods, or another number of symbol periods. In acase where the subframe includes two slots (e.g., when m=1), thesubframe may include 2L symbol periods, where the 2L symbol periods ineach subframe may be assigned indices of 0 through 2L−1. In someaspects, a scheduling unit for the FDD may be frame-based,subframe-based, slot-based, symbol-based, and/or the like.

While some techniques are described herein in connection with frames,subframes, slots, and/or the like, these techniques may equally apply toother types of wireless communication structures, which may be referredto using terms other than “frame,” “subframe,” “slot,” and/or the likein 5G NR. In some aspects, a wireless communication structure may referto a periodic time-bounded communication unit defined by a wirelesscommunication standard and/or protocol. Additionally, or alternatively,different configurations of wireless communication structures than thoseshown in FIG. 3A may be used.

In certain telecommunications (e.g., NR), a base station may transmitsynchronization signals. For example, a base station may transmit aprimary synchronization signal (PSS), a secondary synchronization signal(SSS), and/or the like, on the downlink for each cell supported by thebase station. The PSS and SSS may be used by UEs for cell search andacquisition. For example, the PSS may be used by UEs to determine symboltiming, and the SSS may be used by UEs to determine a physical cellidentifier, associated with the base station, and frame timing. The basestation may also transmit a physical broadcast channel (PBCH). The PBCHmay carry some system information, such as system information thatsupports initial access by UEs.

In some aspects, the base station may transmit the PSS, the SSS, and/orthe PBCH in accordance with a synchronization communication hierarchy(e.g., a synchronization signal (SS) hierarchy) including multiplesynchronization communications (e.g., SS blocks), as described below inconnection with FIG. 3B.

FIG. 3B is a block diagram conceptually illustrating an example SShierarchy, which is an example of a synchronization communicationhierarchy. As shown in FIG. 3B, the SS hierarchy may include an SS burstset, which may include a plurality of SS bursts (identified as SS burst0 through SS burst B−1, where B is a maximum number of repetitions ofthe SS burst that may be transmitted by the base station). As furthershown, each SS burst may include one or more SS blocks (identified as SSblock 0 through SS block (b_(max_SS)−1), where b_(max_SS)−1 is a maximumnumber of SS blocks that can be carried by an SS burst). In someaspects, different SS blocks may be beam-formed differently. An SS burstset may be periodically transmitted by a wireless node, such as every Xmilliseconds, as shown in FIG. 3B. In some aspects, an SS burst set mayhave a fixed or dynamic length, shown as Y milliseconds in FIG. 3B.

The SS burst set shown in FIG. 3B is an example of a synchronizationcommunication set, and other synchronization communication sets may beused in connection with the techniques described herein. Furthermore,the SS block shown in FIG. 3B is an example of a synchronizationcommunication, and other synchronization communications may be used inconnection with the techniques described herein.

In some aspects, an SS block includes resources that carry the PSS, theSSS, the PBCH, and/or other synchronization signals (e.g., a tertiarysynchronization signal (TSS)) and/or synchronization channels. In someaspects, multiple SS blocks are included in an SS burst, and the PSS,the SSS, and/or the PBCH may be the same across each SS block of the SSburst. In some aspects, a single SS block may be included in an SSburst. In some aspects, the SS block may be at least four symbol periodsin length, where each symbol carries one or more of the PSS (e.g.,occupying one symbol), the SSS (e.g., occupying one symbol), and/or thePBCH (e.g., occupying two symbols).

In some aspects, the symbols of an SS block are consecutive, as shown inFIG. 3B. In some aspects, the symbols of an SS block arenon-consecutive. Similarly, in some aspects, one or more SS blocks ofthe SS burst may be transmitted in consecutive radio resources (e.g.,consecutive symbol periods) during one or more slots. Additionally, oralternatively, one or more SS blocks of the SS burst may be transmittedin non-consecutive radio resources.

In some aspects, the SS bursts may have a burst period, whereby the SSblocks of the SS burst are transmitted by the base station according tothe burst period. In other words, the SS blocks may be repeated duringeach SS burst. In some aspects, the SS burst set may have a burst setperiodicity, whereby the SS bursts of the SS burst set are transmittedby the base station according to the fixed burst set periodicity. Inother words, the SS bursts may be repeated during each SS burst set.

The base station may transmit system information, such as systeminformation blocks (SIBs) on a physical downlink shared channel (PDSCH)in certain slots. The base station may transmit control information/dataon a physical downlink control channel (PDCCH) in C symbol periods of aslot, where B may be configurable for each slot. The base station maytransmit traffic data and/or other data on the PDSCH in the remainingsymbol periods of each slot.

As indicated above, FIGS. 3A and 3B are provided as examples. Otherexamples may differ from what is described with regard to FIGS. 3A and3B.

FIG. 4 shows an example slot format 410 with a normal cyclic prefix. Theavailable time frequency resources may be partitioned into resourceblocks. Each resource block may cover a set of subcarriers (e.g., 12subcarriers) in one slot and may include a number of resource elements.Each resource element may cover one subcarrier in one symbol period(e.g., in time) and may be used to send one modulation symbol, which maybe a real or complex value.

An interlace structure may be used for each of the downlink and uplinkfor FDD in certain telecommunications systems (e.g., NR). For example, Qinterlaces with indices of 0 through Q−1 may be defined, where Q may beequal to 4, 6, 8, 10, or some other value. Each interlace may includeslots that are spaced apart by Q frames. In particular, interlace q mayinclude slots q, q+Q, q+2Q, etc., where q∈{0, . . . , Q−1}.

A UE may be located within the coverage of multiple BSs. One of theseBSs may be selected to serve the UE. The serving BS may be selectedbased at least in part on various criteria such as received signalstrength, received signal quality, path loss, and/or the like. Receivedsignal quality may be quantified by a signal-to-noise-and-interferenceratio (SNIR), or a reference signal received quality (RSRQ), or someother metric. The UE may operate in a dominant interference scenario inwhich the UE may observe high interference from one or more interferingBSs.

While aspects of the examples described herein may be associated with NRor 5G technologies, aspects of the present disclosure may be applicablewith other wireless communication systems. New Radio (NR) may refer toradios configured to operate according to a new air interface (e.g.,other than Orthogonal Frequency Divisional Multiple Access (OFDMA)-basedair interfaces) or fixed transport layer (e.g., other than InternetProtocol (IP)). In aspects, NR may utilize OFDM with a CP (hereinreferred to as cyclic prefix OFDM or CP-OFDM) and/or SC-FDM on theuplink, may utilize CP-OFDM on the downlink and include support forhalf-duplex operation using time division duplexing (TDD). In aspects,NR may, for example, utilize OFDM with a CP (herein referred to asCP-OFDM) and/or discrete Fourier transform spread orthogonalfrequency-division multiplexing (DFT-s-OFDM) on the uplink, may utilizeCP-OFDM on the downlink and include support for half-duplex operationusing TDD. NR may include Enhanced Mobile Broadband (eMBB) servicetargeting wide bandwidth (e.g., 80 megahertz (MHz) and beyond),millimeter wave (mmW) targeting high carrier frequency (e.g., 60gigahertz (GHz)), massive MTC (mMTC) targeting non-backward compatibleMTC techniques, and/or mission critical targeting ultra reliable lowlatency communications (URLLC) service.

In some aspects, a single component carrier bandwidth of 100 MHz may besupported. NR resource blocks may span 12 sub-carriers with asub-carrier bandwidth of 60 or 120 kilohertz (kHz) over a 0.1millisecond (ms) duration. Each radio frame may include 40 slots and mayhave a length of 10 ms. Consequently, each slot may have a length of0.25 ms. Each slot may indicate a link direction (e.g., DL or UL) fordata transmission and the link direction for each slot may bedynamically switched. Each slot may include DL/UL data as well as DL/ULcontrol data.

Beamforming may be supported and beam direction may be dynamicallyconfigured. MIMO transmissions with precoding may also be supported.MIMO configurations in the DL may support up to 8 transmit antennas withmulti-layer DL transmissions up to 8 streams and up to 2 streams per UE.Multi-layer transmissions with up to 2 streams per UE may be supported.Aggregation of multiple cells may be supported with up to 8 servingcells. Alternatively, NR may support a different air interface, otherthan an OFDM-based interface. NR networks may include entities such ascentral units or distributed units.

As indicated above, FIG. 4 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 4 .

FIG. 5 illustrates an example logical architecture of a distributed RAN500, according to aspects of the present disclosure. A 5G access node506 may include an access node controller (ANC) 502. The ANC may be acentral unit (CU) of the distributed RAN 500. The backhaul interface tothe next generation core network (NG-CN) 504 may terminate at the ANC.The backhaul interface to neighboring next generation access nodes(NG-ANs) may terminate at the ANC. The ANC may include one or more TRPs508 (which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs, APs,gNB, or some other term). As described above, a TRP may be usedinterchangeably with “cell.”

The TRPs 508 may be a distributed unit (DU). The TRPs may be connectedto one ANC (ANC 502) or more than one ANC (not illustrated). Forexample, for RAN sharing, radio as a service (RaaS), and servicespecific AND deployments, the TRP may be connected to more than one ANC.A TRP may include one or more antenna ports. The TRPs may be configuredto individually (e.g., dynamic selection) or jointly (e.g., jointtransmission) serve traffic to a UE.

The local architecture of RAN 500 may be used to illustrate fronthauldefinition. The architecture may be defined that support fronthaulingsolutions across different deployment types. For example, thearchitecture may be based at least in part on transmit networkcapabilities (e.g., bandwidth, latency, and/or jitter).

The architecture may share features and/or components with LTE.According to aspects, the next generation AN (NG-AN) 510 may supportdual connectivity with NR. The NG-AN may share a common fronthaul forLTE and NR.

The architecture may enable cooperation between and among TRPs 508. Forexample, cooperation may be preset within a TRP and/or across TRPs viathe ANC 502. According to aspects, no inter-TRP interface may beneeded/present.

According to aspects, a dynamic configuration of split logical functionsmay be present within the architecture of RAN 500. The packet dataconvergence protocol (PDCP), radio link control (RLC), media accesscontrol (MAC) protocol may be adaptably placed at the ANC or TRP.

According to various aspects, a BS may include a central unit (CU)(e.g., ANC 502) and/or one or more distributed units (e.g., one or moreTRPs 508).

As indicated above, FIG. 5 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 5 .

FIG. 6 illustrates an example physical architecture of a distributed RAN600, according to aspects of the present disclosure. A centralized corenetwork unit (C-CU) 602 may host core network functions. The C-CU may becentrally deployed. C-CU functionality may be offloaded (e.g., toadvanced wireless services (AWS)), in an effort to handle peak capacity.

A centralized RAN unit (C-RU) 604 may host one or more ANC functions.Optionally, the C-RU may host core network functions locally. The C-RUmay have distributed deployment. The C-RU may be closer to the networkedge.

A distributed unit (DU) 606 may host one or more TRPs. The DU may belocated at edges of the network with radio frequency (RF) functionality.

As indicated above, FIG. 6 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 6 .

FIG. 7 is a diagram illustrating an example 700 of a multi-transmitreceive point (TRP) communication with single downlink controlinformation (DCI), in accordance with various aspects of the presentdisclosure.

As shown in FIG. 7 , multiple TRPs 110 (shown as TRP₁ 110 a and TRP₂ 110b) may communicate with the same UE 120 in a coordinated manner (e.g.,using coordinated multi-point transmissions and/or the like) to improvereliability, increase throughput, and/or the like. The TRPs 110 maycoordinate these communications via a backhaul, which may have a smallerdelay or higher capacity when the TRPs 110 are co-located (e.g., wherethe TRPs 110 correspond to different antenna arrays of a particular basestation) or may have a larger delay or lower capacity when the TRPs 110are not co-located (e.g., located at different base stations).

In some aspects, TRP₁ 110 a and TRP₂ 110 b may be referred to herein asa multi-TRP group. As used herein, a multi-TRP group may refer to a setof TRPs 110 that are to communicate with the same UE 120, a set of TRPs110 managed as a group by an access node controller, a set of TRPs 110that transmit the same physical downlink shared channel (PDSCH), a setof TRPs 110 that transmit individual PDSCHs simultaneously orcontemporaneously, and/or the like.

A TRP 110 also may be referred to as a BS, an NR BS, a Node B, a 5G NB,an AP, a gNB, a panel, a remote radio head (RRH), or some other term, ormay be used interchangeably with “cell.” In some aspects, multiple TRPs110 may be included in a single BS (e.g., using respective antennapanels or quasi co-location (QCL) relationships). In some aspects,different TRPs 110 may be included in different BSs. A TRP 110 may useone or more antenna ports. A set of TRPs 110 (e.g., TRP₁ 110 a and TRP₂110 b) may be configured to individually (such as using dynamicselection) or jointly (such as using joint transmission) serve trafficto a UE 120. TRPs 110 may be coordinated by or cooperative via an accessnode controller (ANC). In some aspects, no inter-TRP interface may beneeded or present.

As shown in FIG. 7 , and by reference number 702, a set of TRPs 110 mayoperate in a single downlink control information (DCI) mode, where UE120 receives a single physical downlink control channel (PDCCH) from oneTRP 110 (e.g., TRP₁ 110 a in the illustrated example 700), and thesingle PDCCH schedules subsequent communications from each TRP 110 inthe multi-TRP group (e.g., TRP₁ 110 a and TRP₂ 110 b in the illustratedexample 700). For example, as further shown in FIG. 7 , and by referencenumber 704, the subsequent communications may be physical downlinkshared channels (PDSCHs), which may be common between TRP₁ 110 a andTRP₂ 110 b or may be different (e.g., different payload, differentmodulation and/or coding schemes, different transmit powers, differentrepetition schemes, and/or the like). In some aspects, as mentionedabove, the multiple TRPs 110 a, 110 b may be different panels of aparticular base station, may be associated with the same or differentcell identifiers, may have the same or different physical cellidentities (PCIs), and/or the like. However, from a perspective of UE120, transmissions from the multiple TRPs 110 a, 110 b are observed asdifferent beams or transmissions with different transmissionconfiguration indicator (TCI) states.

According to various aspects, there are different schemes that may beused for communication between the multi-TRP group and UE 120. Forexample, in some aspects, TRPs 110 a, 110 b may communicate with UE 120according to a spatial division multiplexing (SDM) scheme in which TRPs110 a, 110 b may use different spatial layers (e.g., different multipleinput multiple output (MIMO) layers) to transmit the PDSCH inoverlapping resource blocks (RBs) and/or symbols. In another example,TRPs 110 a, 110 b may communicate with UE 120 according to a timedivision multiplexing (TDM) scheme in which the multiple TRPs 110 a, 110b transmit the PDSCH in different OFDM symbols, in different slots,and/or the like. In another example, TRPs 110, 110 b may communicatewith UE 120 according to a frequency division multiplexing (FDM) schemein which the multiple TRPs 110 a, 110 b transmit the PDSCH in differentRBs.

As further shown in FIG. 7 , the PDCCH received from TRP₁ 110 a mayinclude or otherwise be associated with a single DCI message, which mayinclude a frequency domain resource allocation (FDRA) field to indicatean aggregate RB allocation across multiple TCI states (e.g., across afirst TCI state associated with TRP₁ 110 a, a second TCI stateassociated with TRP₂ 110 b, and/or the like). Accordingly, as shown byreference number 706, UE 120 may apply a frequency division multiplexing(FDM) scheme based on the RB allocation to receive RB sets associatedwith the multiple TCI states when the TRPs 110, 110 b communicate withUE 120 according to the FDM scheme. For example, as shown by referencenumber 708, the FDM scheme in the illustrated example 700 includes twoRB sets on the same OFDM symbols, labelled RB set 1 and RB set 2, andeach TRP 110 transmits one of the RB sets. For example, TRP₁ 110 a maytransmit RB set 1 and TRP₂ 110 b may transmit RB set 2, whereby eachnon-overlapping frequency resource allocation (e.g., RB set) may beassociated with one TCI state. In general, the RB sets may have the samenumber of layers, the same set of demodulation reference signal (DMRS)ports, the same OFDM symbols, and/or the like. From the perspective ofUE 120, there are two schemes that may be used to receive the two RBsets from TRPs 110 a, 110 b.

For example, in a first scheme as shown by reference number 710, thereis one codeword 712 with one redundancy version (RV) used across anaggregate resource allocation. Accordingly, the UE 120 observes the one(large) codeword 712, and different coded bits in the codeword 712 aremapped to different RBs. For example, after UE 120 has demodulated thecodeword 712, the demodulated codeword 712 is mapped first in frequencyand then in time. In the first scheme shown by reference number 710,some of the coded bits in the demodulated codeword 712 are mapped to RBset 1 and some of the coded bits are mapped to RB set 2.

In some aspects, in a second scheme as shown by reference number 714,each RB set is associated with a different codeword of the sametransport block (TB), with one RV used for each non-overlappingfrequency resource allocation. For example, in FIG. 7 , the secondscheme includes a first codeword 716 and a second codeword 718 in thesame circular buffer, which means that data in the circular buffer isencoded and different RVs are used to read the data out of the circularbuffer. For the mapping to the RB sets, coded bits of the first codeword716 are mapped to RB set 1 and the coded bits of the second codeword 718are mapped to RB set 2.

Accordingly, from the perspective of UE 120, a particular TCI stategenerally applies to a particular RB set, and each TCI state maycorrespond to beam information, quasi co-location (QCL) information,and/or the like associated with a corresponding TRP 110. In someaspects, as described in more detail elsewhere herein, UE 120 maytherefore determine a mapping from an FDRA indicated in the single DCImessage to different TCI states that may be associated with differentTRPs 110.

As indicated above, FIG. 7 is provided as an example. Other examples maydiffer from what is described with respect to FIG. 7 .

FIG. 8 is a diagram illustrating an example 800 of a frequency domainresource allocation (FDRA), in accordance with various aspects of thepresent disclosure. For example, in some aspects, the FDRA may beassociated with a resource allocation type, which may be indicated in aparameter associated with a DCI message, a radio resource control (RRC)configuration, and/or the like. In general, the resource allocation typemay include a first type (type 0) that is based on resource block groups(RBGs) or a second type (type 1) that is based on virtual resourceblocks (VRBs) that are mapped to physical resource blocks (PRBs).Furthermore, the second type of resource allocation may include a firstsub-type (without interleaving) and a second sub-type (withinterleaving).

For example, when the resource allocation type is RBG-based (type 0), atotal number of RBGs in a bandwidth part (BWP) may be denoted as N_RBG,in which case an FDRA field (e.g., in the DCI message scheduling thePDSCH, an RRC configuration message, and/or the like) may be a bitmap ofsize N_RBG indicating scheduled RBGs out of all N_RBG RBGs in the BWP.Each bit in the bitmap may be applied to one RBG. For example, a bitmap(or bit string) of ‘00110100000’ may indicate that the third, fourth,and sixth RBGs are scheduled based on the third, fourth, and sixth bitshaving a value of one (1), and all other RBGs may be unscheduled basedon the other bits having a value of zero (0). In some aspects, the RBGsize, denoted by P, may generally refer to a quantity of RBs that can beincluded in one RBG, and P can be {2, 4, 8, 16} RBs depending on a BWPsize, an RRC configuration, and/or the like.

In other examples, when the resource allocation is based on a mappingfrom a VRB domain to a PRB domain (type 1), the FDRA field effectivelyindicates a start RB in the VRB domain and a number of scheduled orallocated RBs in the VRB domain. Accordingly, because the scheduled orallocated RBs are always contiguous in the VRB domain, the aggregateFDRA in the VRB domain can be derived based on the start RB and thenumber of scheduled or allocated RBs. For example, as shown in FIG. 8 ,and by reference numbers 810 and 812, the FDRA field may indicate thatthe start RB is RB 1 and that the number of scheduled or allocated RBsis four. In this case, a UE can determine that the allocated RBs (in theVRB domain) includes RBs 1-4 based on the configuration wherebyscheduled or allocated RBs are contiguous in the VRB domain.

Furthermore, in some aspects, the DCI message may include a VRB-PRBmapping field, which may be set to zero (0) to indicate that the VRB-PRBmapping is non-interleaved or set to one (1) to indicate that theVRB-PRB is interleaved. For example, in FIG. 8 , reference number 810illustrates the non-interleaved case, where VRB_(n) is mapped toPRB_(n), which results in a mapping in which the PRBs are alsocontiguous because the VRBs are contiguous. In other words, when theVRB-PRB mapping is non-interleaved, the allocation of PRBs is equivalentto the allocation of VRBs. However, if the VRB-PRB mapping field is setto one (1), this may indicate that the PRBs are mapped to the VRBsaccording to a function f(·), in which case RB bundles are formed in theVRB domain and the PRB domain in a given BWP. Each RB bundle may have aparticular size, L, which can be provided in a higher-layer parameter(e.g., a vrb-ToPRB-Interleaver parameter provided in an RRCconfiguration) and have a value of two or four RBs. Accordingly, asshown in FIG. 8 , and by reference number 812, the allocated PRBs may benon-contiguous in the interleaved case, with VRB bundle j mapped to PRBbundle f(j) based on the function f(·). However, in cases where the FDRAschedules or otherwise allocates all of the available VRB bundles in theBWP, then all available PRBs in the BWP are also scheduled or otherwiseallocated. In this case, the PRBs may appear to be contiguous eventhough the interleaving function is still used to map the scheduled VRBbundles to the PRB bundles.

As indicated above, FIG. 8 is provided as an example. Other examples maydiffer from what is described with respect to FIG. 8 .

FIGS. 9A-9B are diagrams illustrating an example 900 of a multi-TRPcommunication in which a UE assigns an allocated FDRA indicated in asingle DCI message to different TCI states based on a size associatedwith a precoding resource block group (PRG) and/or a PRB bundle, inaccordance with various aspects of the present disclosure. Inparticular, as used herein, the terms PRG, PRB bundle, and/or the likemay interchangeably refer to a unit of contiguous RBs (in a PRB domain)over which a UE can assume that the same precoding is used; hence, PRGs,PRB bundles, and/or the like can be used as a unit for joint channelestimation.

Accordingly, as shown in FIG. 9A, and by reference number 902, UE 120may receive, from one TRP in a multi-TRP group, a DCI message with anFDRA field that indicates an aggregate RB allocation across multiple TCIstates. For example, there are two TRPs 110 a, 110 b in example 900,whereby the DCI message received from TRP 110 a may indicate anaggregate RB allocation across a first TCI state associated with TRP 110a and a second TCI state associated with TRP 110 b. Furthermore, in someaspects, the DCI message may include a PRB bundling size indicator fieldin cases where one or more higher layer parameters (e.g., aprb-BundlingType parameter) are set to ‘dynamic’ or otherwise enable thePRG and/or PRB bundling size to be changeable by the DCI message. Forexample, the PRB bundling size indicator may be a one-bit value that canbe used to determine a PRG and/or PRB bundling size, P′, which can beequal to one of the values among {2, 4, wideband}. Additionally, oralternatively, if the higher layer parameters do not enable the PRGand/or PRB bundling size to be changeable by the DCI message, then thevalue of P′ may be semi-statically indicated through an RRCconfiguration (e.g., P′ may have a value fixed to one of {2, 4,wideband}).

As further shown in FIG. 9A, and by reference number 904, UE 120 maydetermine the aggregate RB allocation across the multiple TCI statesfrom the FDRA field in the DCI message, and assign allocated RBs, PRGs,PRB bundles, and/or the like to respective TCI states based on the PRGand/or PRB bundling size, P′. For example, where P′ is semi-staticallyindicated, UE 120 may determine the value based on the fixed valueindicated in the RRC configuration. In other examples, where the DCImessage includes a PRB bundling size indicator field to dynamicallyindicate and/or change the PRG and/or PRB bundling size, UE 120 maydetermine the value of P′ based on various rules associated with the PRBbundling size indicator field.

For example, if P′=4 RBs, the RBG size (P) for resource allocation type0 cannot be 2, as the 4 RBs making up the unit of channel estimationcannot be grouped into a bitmap with only two RBs (i.e., the bitmapwould need at least four RBs). The same rule applies to the RB bundlesize, L, used for resource allocation type 1 with interleaving, asinterleaving cannot be performed with an interleaving unit equal to 2RBs when the PRG size is equal to 4 RBs. However, the opposite is true,in that P′ can be 2 if the RBG size or the RB bundle size is 4.Accordingly, one condition may be that the RBG size and/or the RB bundlesize are larger than the PRG and/or PRB bundling size, and anothercondition may be that the RBG size and/or RB bundle size is a multipleof the PRG and/or PRB bundling size (e.g., in cases where P′ is 2 or 4).Furthermore, if P′=wideband, then the allocated PRBs should becontiguous to allow for wideband channel estimation. This is because UE120 assumes that the same precoding is applied to all the PDSCH RBs,whereby the allocated PRBs should be contiguous (e.g., because the sameprecoding cannot be assumed for non-contiguous RBs). In some aspects,the condition whereby a wideband PRG and/or PRB bundling size is coupledwith contiguous RBs is applicable in environments in which there is onlyone TCI state across all RBs. For multi-TRP environments that use an FDMscheme with a wideband PRG and/or PRB bundling size, RBs per TCI stateshould be contiguous, as different precoding is generally used whenthere are different TCI states.

Accordingly, in some aspects, UE 120 may use the PRG and/or PRB bundlingsize to determine how to divide the aggregate RB allocation indicated inthe DCI message among multiple RB sets that correspond to different TCIstates. For example, as further shown in FIG. 9A, and by referencenumber 906, UE 120 may receive downlink transmissions from multiple TRPs110 a, 110 b, which may be associated with different TCI states. In thisway, by using the PRG and/or PRB bundling size to divide the aggregateRB allocation indicated in FDRA field of the DCI message among multipleRB sets that correspond to different TCI states, UE 120 may correctlyprocess the downlink transmissions that are associated with thedifferent TCI states.

For example, in cases where UE 120 determines that the PRG and/or PRBbundling size is “wideband”, the assignment of allocated RBs torespective TCI states may depend on whether the allocated PRBs arecontiguous. In cases where the allocated PRBs are contiguous, theallocated RBs may be divided into n sets that include an equal orapproximately equal number of the allocated RBs and each of the n setsmay be assigned to a respective one of the individual TCI states, wheren is a quantity of the individual TCI states. For example, in FIG. 9A,the multi-TRP group includes two TRPs 110 a, 110 b, whereby a first halfof the allocated RBs (┌N_(RB)/2┐) are assigned to a first TCI stateassociated with TRP 110 a, and a second half of the allocated RBs(└N_(RB)/2┘) are assigned to a second TCI state associated with TRP 110b, where N_(RB) is a quantity of allocated RBs indicated in the FDRAfield of the DCI message. In such cases, one or more ceiling and/orfloor operations are used to ensure that a number of RBs in each set isan integer value (e.g., because allocated RBs are non-overlapping in FDMschemes and therefore cannot be assigned in fractional values). Forexample, where the FDRA field allocates 5 RBs, RBG, PRGs, RB bundles,and/or the like among two TCI states, a half/half split using theceiling and floor operations may result in 3 sets being assigned to oneTCI state and 2 sets being assigned to the other TCI state.

In other examples, where the PRG and/or PRB bundling size is “wideband”and the allocated PRBs are not contiguous but include multiplecontiguous parts, then each contiguous part may be assigned to arespective TCI. For example, if the allocated PRBs include twocontiguous parts, UE 120 may assign a first contiguous part to the firstTCI state associated with TRP 110 a and assign a second contiguous partto the second TCI state associated with TRP 110 b.

In some aspects, when UE 120 determines that the PRG and/or PRB bundlingsize is a value other than “wideband” (e.g., 2 or 4), allocated PRGs,PRB bundles, and/or the like may be determined based on the FDRA field,PRG size, BWP size, location, and/or the like. For example, as shown inFIG. 9B, and by reference number 910, a BWP may include n PRGs, PRBbundles, and/or the like, which may be associated with indices (i) from0≤i≤n−1. As further shown by reference number 910, UE 120 may determine(e.g., based on the FDRA field) that PRGs and/or PRB bundles associatedwith indices 1, 2, 4, 5, and 6 are allocated, where each PRG and/or PRBbundle includes two or four RBs depending on the PRG and/or PRB bundlingsize.

In some aspects, UE 120 may determine a scheme to be used to divide theallocated PRGs, PRB bundles, and/or the like based on a dynamicindicator included in the DCI message, a higher-layer RRC configuration,and/or the like. In some aspects, the scheme may include assigning anindex to each individual PRG among the allocated PRGs and mapping theindex assigned to each individual PRG to a respective one of theindividual TCI states according to a function that is based at least inpart on a quantity of the individual TCI states. For example, when thereare two individual TCI states, this function may result in PRGs that areassociated with even indices being assigned to the first TCI stateassociated with TRP 110 a, and PRGs that are associated with odd indicesbeing assigned to the second TCI state associated with TRP 110 b. Moregenerally, the function may be based on a modulo operator that causes aset of PRGs that are assigned a particular index to be mapped to aparticular TCI state when dividing the particular index by the quantityof the individual TCI states results in a remainder that equals theparticular index. For example, a PRG associated with a particular indexnumber may be assigned to TCI state i when the particular index numbermod n is equal to i, where n is the quantity of the individual TCIstates.

In some aspects, the allocated PRGs, PRB bundles, and/or the like may beindexed with respect to an entire bandwidth part. For example, asfurther shown in FIG. 9B, and by reference number 912, the PRG indicescover the entire bandwidth part, PRGs associated with even indices areassigned to the first TCI state associated with TRP 110 a, and PRGsassociated with odd indices are assigned to the second TCI stateassociated with TRP 110 b. In other examples, as shown by referencenumber 914, PRG indexing may be performed with respect to only theallocated RBs (e.g., PRGs are re-indexed starting from 0 within theallocated RBs), and PRGs associated with even indices are similarlyassigned to the first TCI state while PRGs associated with odd indicesare assigned to the second TCI state.

In some aspects, the scheme used to divide the allocated PRGs, PRBbundles, and/or the like may be similar to the approach described abovein cases where the PRG size is wideband and the allocated PRBs arecontiguous, except that the units may be in terms of PRGs and/or PRBbundles rather than RBs. In particular, the allocated PRGs, PRB bundles,and/or the like may be divided into n sets that include an equal orapproximately equal number of the allocated PRGs, PRB bundles, and/orthe like, and each of the n sets may be assigned to a respective one ofthe individual TCI states, where n is a quantity of the individual TCIstates. For example, as shown in FIG. 9B, and by reference number 916, afirst half of the allocated PRGs are assigned to the first TCI state anda second half of the allocated PRGs are assigned to the second TCI statebased on one or more ceiling and/or floor operations.

As indicated above, FIGS. 9A-9B are provided as an example. Otherexamples may differ from what is described with respect to FIGS. 9A-9B.

FIGS. 10A-10E are diagrams illustrating an example 1000 of a multi-TRPcommunication in which a UE assigns an allocated FDRA indicated in asingle DCI message to different TCI states based on a resourceallocation type, in accordance with various aspects of the presentdisclosure. For example, as mentioned above, a resource allocation typemay be RBG-based (type 0), based on a non-interleaved VRB-to-PRB mapping(type 1 without interleaving), or based on an interleaved VRB-to-PRBmapping (type 1 with interleaving). Accordingly, in some aspects, asshown by reference number 1004, UE 120 may assign the allocated RBsindicated in the FDRA field to different TCI states based on theresource allocation type.

For example, FIG. 10B illustrates various assignment schemes that may beapplied when the resource allocation type is RBG-based (type 0). Asshown by reference number 1010, an example bandwidth part may include 8RBGs, and each RBG may have a size, P, that can be {2,4,8,16} RBs. Inthe illustrated example, the FDRA field in the DCI message indicatesthat RBGs 1, 2, 4, 5, and 6 are allocated, and various approaches can beused to assign the allocated RBGs to different TCI states. For example,as shown by reference number 1012, allocated RBGs can be indexed (e.g.,within the bandwidth part or within only the allocated RBGs) and eachindex may be mapped to a respective TCI state according to a functionthat is based at least in part on a quantity of the individual TCIstates. For example, where there are two TCI states, the function mayresult in a mapping whereby RBGs with an even index are assigned to thefirst TCI state and RBGs with an odd index are assigned to the secondTCI state.

Additionally, or alternatively, the allocated RBGs can be divided intomultiple sets that include an equal or approximately equal quantity ofRBGs, and each set may be assigned to a respective TCI state. Forexample, as shown by reference number 1014, the allocated RBGs may bedivided into two sets when there are two TCI states, with a first halfof the allocated RBGs assigned to the first TCI state and a second halfof the allocated RBGs assigned to the second TCI state. In this case,floor and ceiling operations are used in a similar manner as describedelsewhere herein when dividing the allocated RBGs into the multiplesets. Additionally, or alternatively, in cases where the PRG size isdetermined to be wideband and the allocated RBGs are not contiguous butinclude a number of contiguous parts that equals the number of TCIstates, then each contiguous part may be assigned to a respective TCIstate. For example, the allocated RBGs shown by reference number 1010include a first contiguous part (RBGs 1-2) and a second contiguous part(RBGs 4-6) that are not contiguous with respect to one another (i.e.,the aggregate RBG allocation is not contiguous). Accordingly, as shownby reference number 1016, the first contiguous part may be assigned tothe first TCI state and the second contiguous part may be assigned tothe second TCI state.

In some aspects, the particular assignment scheme to be applied when theresource allocation type is RBG-based (type 0) may be determined basedon a higher-layer RRC configuration, indicated dynamically in the DCImessage, and/or based on a function of PRG size. For example, in someaspects, UE 120 may divide the allocated RBGs into multiple sets thatinclude an equal or approximately equal quantity of RBGs when the PRGsize is wideband, and otherwise use the indexing scheme when the PRGsize is a value other than wideband (e.g., 2 or 4).

In other examples, FIG. 10C illustrates various assignment schemes thatmay be applied when the resource allocation type is based on anon-interleaved VRB-to-PRB mapping and the parameter L for an RB bundlesize is not configured. In such non-interleaved cases, as mentionedelsewhere herein, the VRB allocation is the same as the PRB allocationand both are contiguous. For example, as shown by reference number 1020,a bandwidth part includes 8 RBs and the allocated VRBs and/or PRBs arecontiguous, spanning RBs 1-5. With respect to the mapping to TCI states,different approaches may be used based on the PRG size, which may resultin a mapping that is similar to that described in further detail abovewith respect to FIGS. 9A-9B. For example, reference number 1022illustrates the case where the PRG size is wideband, which results in asplit of two halves according to an RB unit, with a first half assignedto the first TCI state and a second half assigned to the second TCIstate. As mentioned elsewhere herein, splitting or otherwise dividingthe allocated RBs into sets with an equal or approximately number of RBsmay be performed using one or more ceiling and/or floor operations.

In other examples, where the PRG size is a value other than “wideband”(e.g., 2 or 4), an indexing scheme may be used, and the indexing schememay take a PRG alignment into account for assigning RBs to the first TCIstate and the second TCI state. For example, as shown by referencenumber 1024, one PRG may include 2 RBs, whereby a first two RBs in thebandwidth part may be assigned an index of 0, the next two RBs in thebandwidth part may be assigned an index of 1, and/or the like. Asmentioned elsewhere herein, the indices may be assigned with respect tothe entire bandwidth part or only with respect to the allocated RBs. Inthe illustrated example, where there are two TCI states, this scheme mayresult in the assignment shown by reference number 1024, where RBs thatmap to PRGs with an even index are assigned to the first TCI state, andRBs that map to PRGs with an odd index are assigned to the second TCIstate. Additionally, or alternatively, as shown by reference number1026, the allocated RBs may be grouped into sets based on the PRG size(e.g., each set including two RBs based on a PRG size of 2), and a firsthalf of the RBs are assigned to the first TCI state and a second half ofthe RBs are assigned to the second TCI state.

In other examples, FIGS. 10D-10E illustrate various assignment schemesthat may be applied when the resource allocation type is based on aninterleaved VRB-to-PRB mapping or a non-interleaved VRB-to-PRB mappingin cases where the RB bundle size parameter, L, is configured and usedfor the purpose of assigning allocated RBs to respective TCI states. Forexample, in some aspects, the RB bundle size, L, may be determined froma parameter provided in an RRC configuration (e.g., avrb-ToPRB-Interleaver parameter). Accordingly, in some aspects, even RBbundles may be assigned to the first TCI state and odd RB bundles may beassigned to the second TCI state, with indexing to determine even/oddperformed based on an RB bundle index within a bandwidth part or withinallocated RBs only, or half of the allocated RB bundles may be assignedto the first TCI state and the other half assigned to the second TCIstate. As mentioned elsewhere herein, these examples are described in acontext of a multi-TRP group including two TRPs (associated with two TCIstates), and in some aspects, the assignment schemes may be generalizedto cases where there are n TCI states (e.g., dividing the allocated RBbundles into n sets that have an equal or approximately equal quantityof RB bundles, performing the indexing based on a modulo operator orother function, and/or the like). Furthermore, the particular assignmentscheme to be applied may be determined based on a higher-layer RRCconfiguration, indicated dynamically in the DCI message, and/or based onPRG size.

In some aspects, the various assignment schemes that map RB bundles tothe respective TCI states can be performed in a VRB domain (e.g., VRBindices are used) or in a PRB domain (e.g., PRB indices are used). Forexample, in FIG. 10D, reference number 1030 illustrates allocated RBbundles determined from the FDRA field in the DCI message in the VRBdomain, reference number 1032 illustrates a mapping in which RB bundleswith an even index are assigned to the first TCI state and RB bundleswith an odd index are assigned to the second TCI state, and referencenumber 1034 illustrates a mapping in which a first half of allocated RBbundles are assigned to the first TCI state and a second half of theallocated RB bundles are assigned to the second TCI state. As furthershown in FIG. 10D, and by reference number 1036, the assignment of theallocated RB bundles may then be translated to the PRB domain based onthe applicable interleaving function.

Additionally, or alternatively, the RB bundles may be mapped to therespective TCI states directly in the PRB domain. For example, as shownin FIG. 10E, reference number 1040 illustrates allocated RB bundles(e.g., as determined from the FDRA field) in the PRB domain, referencenumber 1042 illustrates a mapping in which RB bundles with an even indexare assigned to the first TCI state and RB bundles with an odd index areassigned to the second TCI state, and reference number 1044 illustratesa mapping in which a first half of allocated RB bundles are assigned tothe first TCI state and a second half of the allocated RB bundles areassigned to the second TCI state.

As indicated above, FIGS. 10A-10E are provided as examples. Otherexamples may differ from what is described with respect to FIGS.10A-10E.

FIG. 11 is a diagram illustrating an example process 1100 performed, forexample, by a UE, in accordance with various aspects of the presentdisclosure. Example process 1100 is an example where a UE (e.g., UE 120and/or the like) assigns an FDRA indicated in a single DCI message tomultiple TCI states based on a PRG size, a PRB bundle size, and/oranother unit of contiguous RBs over which the same precoding is used(e.g., to enable joint channel estimation).

As shown in FIG. 11 , in some aspects, process 1100 may includereceiving a DCI message that includes an FDRA field to indicateallocated RBs across multiple TCI states (block 1110). For example, theUE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receiveprocessor 258, controller/processor 280, memory 282, and/or the like)may receive a DCI message that includes an FDRA field to indicateallocated RBs across multiple TCI states, as described above.

As further shown in FIG. 11 , in some aspects, process 1100 may includeidentifying, based at least in part on one or more of the DCI message oran RRC configuration, at least one parameter that indicates a unit ofcontiguous RBs over which the same precoding is used (block 1120). Forexample, the UE (e.g., using receive processor 258, transmit processor264, controller/processor 280, memory 282, and/or the like) mayidentify, based at least in part on one or more of the DCI message or anRRC configuration, at least one parameter that indicates a unit ofcontiguous RBs over which the same precoding is used, as describedabove.

As further shown in FIG. 11 , in some aspects, process 1100 may includeassigning the allocated RBs to individual TCI states among the multipleTCI states based at least in part on the at least one parameter thatindicates the unit of contiguous RBs over which the same precoding isused (block 1130). For example, the UE (e.g., using receive processor258, transmit processor 264, controller/processor 280, memory 282,and/or the like) may assign the allocated RBs to individual TCI statesamong the multiple TCI states based at least in part on the at least oneparameter that indicates the unit of contiguous RBs over which the sameprecoding is used, as described above.

Process 1100 may include additional aspects, such as any single aspector any combination of aspects described below and/or in connection withone or more other processes described elsewhere herein.

In a first aspect, the at least one parameter includes one or more of aPRG size or a PRB bundle size.

In a second aspect, alone or in combination with the first aspect,assigning the allocated RBs to the individual TCI states includesdividing the allocated RBs into n sets that include an equal orapproximately equal number of the allocated RBs based at least in parton determining that the allocated RBs are contiguous and the unit ofcontiguous RBs over which the same precoding is used is wideband, wheren is a quantity of the individual TCI states, and assigning each of then sets to a respective one of the individual TCI states.

In a third aspect, alone or in combination with one or more of the firstand second aspects, the equal or approximately equal number of theallocated RBs to include in the n sets is determined using one or moreceiling operations and one or more floor operations based at least inpart on a total quantity of the allocated RBs and the quantity of theindividual TCI states.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the unit of contiguous RBs with the sameprecoding is wideband per TCI state for an FDM scheme with the multipleTCI states.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the allocated RBs are contiguous within the nsets.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, assigning the allocated RBs to the individual TCIstates includes determining that the allocated RBs are not contiguousbut include n contiguous parts, and that the unit of contiguous RBs overwhich the same precoding is used is wideband, where n is a quantity ofthe individual TCI states, and assigning each of the n contiguous partsto a respective one of the individual TCI states.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the allocated RBs include allocated PRGsthat are assigned to the individual TCI states according to a schemethat is determined based at least in part on one or more of a dynamicindicator included in the DCI message or the RRC configuration based atleast in part on determining that the unit of contiguous RBs over whichthe same precoding is used is a value other than wideband.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, the scheme includes assigning an index toeach individual PRG among the allocated PRGs based at least in part onan indication in the FDRA field, and the index assigned to eachindividual PRG is mapped to a respective one of the individual TCIstates according to a function that is based at least in part on aquantity of the individual TCI states.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the function causes a first set of PRGs that areassigned even indices to be mapped to a first TCI state and causes asecond set of PRGs that are assigned odd indices to be mapped to asecond TCI state when the quantity of the individual TCI states is two.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, the function is a modulo operator that causes aset of PRGs that are assigned a particular index to be mapped to aparticular TCI state when dividing the particular index by the quantityof the individual TCI states results in a remainder that equals theparticular index.

In an eleventh aspect, alone or in combination with one or more of thefirst through tenth aspects, the index assigned to each PRG isdetermined with respect to an entire bandwidth part.

In a twelfth aspect, alone or in combination with one or more of thefirst through eleventh aspects, the index assigned to each PRG isdetermined with respect to only the allocated RBs indicated in the FDRAfield.

In a thirteenth aspect, alone or in combination with one or more of thefirst through twelfth aspects, the scheme includes dividing theallocated PRGs into n sets that include an equal or approximately equalnumber of the allocated PRGs, where n is a quantity of the individualTCI states, and assigning each of the n sets to a respective one of theindividual TCI states.

In a fourteenth aspect, alone or in combination with one or more of thefirst through thirteenth aspects, the equal or approximately equalnumber of the allocated RBs to include in the n sets is determined usingone or more ceiling operations and one or more floor operations based atleast in part on a total quantity of the allocated RBs and the quantityof the individual TCI states.

Although FIG. 11 shows example blocks of process 1100, in some aspects,process 1100 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 11 .Additionally, or alternatively, two or more of the blocks of process1100 may be performed in parallel.

FIG. 12 is a diagram illustrating an example process 1200 performed, forexample, by a UE, in accordance with various aspects of the presentdisclosure. Example process 1200 is an example where a UE (e.g., UE 120)assigns an FDRA indicated in a single DCI message to multiple TCI statesbased on a resource allocation type (e.g., depending on whether theresource allocation is RBG-based, VRB-based without interleaving,VRB-based with interleaving, and/or the like).

As shown in FIG. 12 , in some aspects, process 1200 may includereceiving a DCI message that includes an FDRA field to indicateallocated RBs across multiple TCI states (block 1210). For example, theUE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receiveprocessor 258, controller/processor 280, memory 282, and/or the like)may receive a DCI message that includes an FDRA field to indicateallocated RBs across multiple TCI states, as described above.

As further shown in FIG. 12 , in some aspects, process 1200 may includeidentifying, based at least in part on one or more of the DCI message oran RRC configuration, at least one parameter that indicates a resourceallocation type (block 1220). For example, the UE (e.g., using receiveprocessor 258, transmit processor 264, controller/processor 280, memory282, and/or the like) may identify, based at least in part on one ormore of the DCI message or an RRC configuration, at least one parameterthat indicates a resource allocation type, as described above.

As further shown in FIG. 12 , in some aspects, process 1200 may includeassigning the allocated RBs to individual TCI states among the multipleTCI states based at least in part on the resource allocation type (block1230). For example, the UE (e.g., using receive processor 258, transmitprocessor 264, controller/processor 280, memory 282, and/or the like)may assign the allocated RBs to individual TCI states among the multipleTCI states based at least in part on the resource allocation type, asdescribed above.

Process 1200 may include additional aspects, such as any single aspector any combination of aspects described below and/or in connection withone or more other processes described elsewhere herein.

In a first aspect, assigning the allocated RBs to the individual TCIstates includes assigning an index to each individual RBG allocated inthe FDRA field based at least in part on determining that the resourceallocation type is RBG-based, and the index assigned to each individualRBG is mapped to a respective one of the individual TCI states accordingto a function that is based at least in part on a quantity of theindividual TCI states.

In a second aspect, alone or in combination with the first aspect, thefunction causes a first set of RBGs that are assigned even indices to bemapped to a first TCI state and causes a second set of RBGs that areassigned odd indices to be mapped to a second TCI state when thequantity of the individual TCI states is two.

In a third aspect, alone or in combination with one or more of the firstand second aspects, the function is a modulo operator that causes a setof RBGs that are assigned a particular index to be mapped to aparticular TCI state when dividing the particular index by the quantityof the individual TCI states results in a remainder that equals theparticular index.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the index assigned to each individual RBGis determined with respect to one or more of RBGs in an entire bandwidthpart or only a set of RBGs that are allocated in the FDRA field.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, assigning the allocated RBs to the individualTCI states includes dividing allocated RBGs into n sets that include anequal or approximately equal number of the allocated RBGs, based atleast in part on determining that the resource allocation type isRBG-based and that a unit of contiguous RBs over which the sameprecoding is used is a value other than wideband, where n is a quantityof the individual TCI states, and assigning each of the n sets to arespective one of the individual TCI states.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, the equal or approximately equal number of theallocated RBGs to include in the n sets is determined using one or moreceiling operations and one or more floor operations based at least inpart on a total quantity of the allocated RBGs and the quantity of theindividual TCI states.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, assigning the allocated RBs to theindividual TCI states includes determining that the FDRA field indicatesallocated RBGs that are not contiguous but include n contiguous parts,and that a unit of contiguous RBs over which the same precoding is usedis wideband, where n is a quantity of the individual TCI states, andassigning each of the n contiguous parts to a respective one of theindividual TCI states based at least in part on determining that theresource allocation type is RBG-based.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, allocated RBGs indicated in the FDRAfield are assigned to the individual TCI states according to a schemethat is determined based at least in part on one or more of a dynamicindicator included in the DCI message, the RRC configuration, or a unitof contiguous RBs over which the same precoding is used based at leastin part on determining that the resource allocation type is RBG-based.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, assigning the allocated RBs to the individualTCI states includes dividing the allocated RBs into n sets that includean equal or approximately equal number of the allocated RBs, based atleast in part on determining that the resource allocation type is basedon a non-interleaved mapping from a VRB domain to a PRB domain and thata unit of contiguous RBs over which the same precoding is used iswideband, where n is a quantity of the individual TCI states, andassigning each of the n sets to a respective one of the individual TCIstates.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, assigning the allocated RBs to the individual TCIstates includes assigning an index to each individual RB among theallocated RBs indicated in the FDRA field based at least in part ondetermining that the resource allocation type is based on anon-interleaved mapping from a VRB domain to a PRB domain without aconfigured parameter for an RB bundle size and that a unit of contiguousRBs over which the same precoding is used is a value other thanwideband, and the index assigned to each individual RB is mapped to arespective one of the individual TCI states according to a function thatis based at least in part on a quantity of the individual TCI states.

In an eleventh aspect, alone or in combination with one or more of thefirst through tenth aspects, the index assigned to each individual RB isdetermined with respect to one or more of available RBs in an entirebandwidth part or only the allocated RBs indicated in the FDRA field.

In a twelfth aspect, alone or in combination with one or more of thefirst through eleventh aspects, the allocated RBs are assigned to theindividual TCI states according to an RB bundle size based at least inpart on determining that the resource allocation type is based on amapping from a VRB domain to a PRB domain with a configured parameterfor the RB bundle size.

In a thirteenth aspect, alone or in combination with one or more of thefirst through twelfth aspects, assigning the allocated RBs to theindividual TCI states includes assigning an index based at least in parton the RB bundle size to each individual RB bundle among allocated RBbundles indicated in the FDRA field, and the index assigned to eachindividual RB bundle is mapped to a respective one of the individual TCIstates according to a function that is based at least in part on aquantity of the individual TCI states.

In a fourteenth aspect, alone or in combination with one or more of thefirst through thirteenth aspects, the index assigned to each individualRB bundle is determined with respect to one or more of available RBbundles in an entire bandwidth part or only the allocated RB bundlesindicated in the FDRA field.

In a fifteenth aspect, alone or in combination with one or more of thefirst through fourteenth aspects, the function causes a first set of RBbundles that are assigned even indices to be mapped to a first TCI stateand causes a second set of RB bundles that are assigned odd indices tobe mapped to a second TCI state when the quantity of the individual TCIstates is two.

In a sixteenth aspect, alone or in combination with one or more of thefirst through fifteenth aspects, the function is a modulo operator thatcauses a set of RB bundles that are assigned a particular index to bemapped to a particular TCI state when dividing the particular index bythe quantity of the individual TCI states results in a remainder thatequals the particular index.

In a seventeenth aspect, alone or in combination with one or more of thefirst through sixteenth aspects, assigning the allocated RBs to theindividual TCI states includes dividing allocated RB bundles into n setsthat include an equal or approximately equal number of the allocated RBbundles based at least in part on the RB bundle size, and assigning eachof the n sets to a respective one of the individual TCI states.

In an eighteenth aspect, alone or in combination with one or more of thefirst through seventeenth aspects, the RB bundle size is indicated inthe RRC configuration.

In a nineteenth aspect, alone or in combination with one or more of thefirst through eighteenth aspects, the allocated RBs include RB bundlesthat are assigned to the individual TCI states in one or more of the VRBdomain or the PRB domain.

Although FIG. 12 shows example blocks of process 1200, in some aspects,process 1200 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 12 .Additionally, or alternatively, two or more of the blocks of process1200 may be performed in parallel.

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the aspects to the preciseform disclosed. Modifications and variations may be made in light of theabove disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware, firmware, and/or a combination of hardware and software. Asused herein, a processor is implemented in hardware, firmware, and/or acombination of hardware and software.

As used herein, satisfying a threshold may, depending on the context,refer to a value being greater than the threshold, greater than or equalto the threshold, less than the threshold, less than or equal to thethreshold, equal to the threshold, not equal to the threshold, and/orthe like.

It will be apparent that systems and/or methods described herein may beimplemented in different forms of hardware, firmware, and/or acombination of hardware and software. The actual specialized controlhardware or software code used to implement these systems and/or methodsis not limiting of the aspects. Thus, the operation and behavior of thesystems and/or methods were described herein without reference tospecific software code—it being understood that software and hardwarecan be designed to implement the systems and/or methods based, at leastin part, on the description herein.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of various aspects. In fact, many ofthese features may be combined in ways not specifically recited in theclaims and/or disclosed in the specification. Although each dependentclaim listed below may directly depend on only one claim, the disclosureof various aspects includes each dependent claim in combination withevery other claim in the claim set. A phrase referring to “at least oneof” a list of items refers to any combination of those items, includingsingle members. As an example, “at least one of: a, b, or c” is intendedto cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combinationwith multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c,a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering ofa, b, and c).

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems, and may be used interchangeably with “one or more.” Furthermore,as used herein, the terms “set” and “group” are intended to include oneor more items (e.g., related items, unrelated items, a combination ofrelated and unrelated items, and/or the like), and may be usedinterchangeably with “one or more.” Where only one item is intended, thephrase “only one” or similar language is used. Also, as used herein, theterms “has,” “have,” “having,” and/or the like are intended to beopen-ended terms. Further, the phrase “based on” is intended to mean“based, at least in part, on” unless explicitly stated otherwise.

What is claimed is:
 1. A method of wireless communication performed by auser equipment (UE), comprising: receiving a downlink controlinformation (DCI) message that includes a frequency domain resourceallocation (FDRA) field to indicate allocated resource blocks (RBs)across multiple transmission configuration indication (TCI) states;identifying, based at least in part on the DCI message and a higherlayer parameter being set to dynamic, a physical RB (PRB) bundle sizeparameter; identifying, based at least in part on the PRB bundle sizeparameter, a precoding RB group (PRG) size parameter that indicates aunit of contiguous RBs over which a same precoding is used; dividing theallocated RBs into n sets that include an equal quantity of theallocated RBs based at least in part on determining that the allocatedRBs are contiguous and that the PRG size parameter indicates wideband,wherein n is a quantity of individual TCI states among the multiple TCIstates; and assigning each of the n sets to a respective one of theindividual TCI states.
 2. The method of claim 1, wherein a first set ofPRGs or a first set of PRBs are assigned to a first TCI state and asecond set of PRGs or a second set of PRBs are assigned to a second TCIstate.
 3. The method of claim 1, wherein the unit of contiguous RBs withthe same precoding is wideband per TCI state for a frequency divisionmultiplexing (FDM) scheme with the multiple TCI states.
 4. The method ofclaim 1, wherein the allocated RBs are contiguous within the n sets. 5.A user equipment (UE) for wireless communication, comprising: a memory;and one or more processors, coupled to the memory, configured to:receive a downlink control information (DCI) message that includes afrequency domain resource allocation (FDRA) field to indicate allocatedresource blocks (RBs) across multiple transmission configurationindication (TCI) states; identify, based at least in part on the DCImessage and a higher layer parameter being set to dynamic, a physical RB(PRB) bundle size parameter; identify, based at least in part on the PRBbundle size parameter, a precoding RB group (PRG) size parameter thatindicates a unit of contiguous RBs over which a same precoding is used;divide the allocated RBs into n sets that include an equal quantity ofthe allocated RBs based at least in part on the allocated RBs beingcontiguous and the PRG size parameter indicating wideband, wherein n isa quantity of individual TCI states among the multiple TCI states; andassign each of the n sets to a respective one of the individual TCIstates.
 6. The UE of claim 5, wherein a first set of PRGs or a first setof PRBs are assigned to a first TCI state and a second set of PRGs or asecond set of PRBs are assigned to a second TCI state.
 7. The UE ofclaim 5, wherein the unit of contiguous RBs with the same precoding iswideband per TCI state for a frequency division multiplexing (FDM)scheme with the multiple TCI states.
 8. The UE of claim 5, wherein theallocated RBs are contiguous within the n sets.
 9. The UE of claim 5,wherein the one or more processors are configured to: determine that theallocated RBs are not contiguous, that the allocated RBs include ncontiguous parts, and that the unit of contiguous RBs over which thesame precoding is used is wideband; and assign, based at least in parton the allocated RBs not being contiguous, the allocated RBs includingthe n contiguous parts, and the unit of contiguous RBs over which thesame precoding is used being wideband, each of the n contiguous parts toa respective one of the individual TCI states.
 10. The UE of claim 5,wherein the allocated RBs include allocated PRGs that are assigned tothe individual TCI states according to a scheme that is determined basedat least in part on the higher layer parameter being set to dynamic andthe unit of contiguous RBs over which the same precoding is used being avalue other than wideband.
 11. The UE of claim 10, wherein the schemeincludes an index being assigned to each individual PRG among theallocated PRGs based at least in part on an indication in the FDRAfield, and wherein the index assigned to each individual PRG is mappedto a respective one of the individual TCI states according to a functionthat is based at least in part on a quantity of the individual TCIstates.
 12. The UE of claim 11, wherein the function causes a first setof PRGs, that are assigned even indices, to be mapped to a first TCIstate and causes a second set of PRGs, that are assigned odd indices, tobe mapped to a second TCI state when the quantity of the individual TCIstates is two.
 13. A non-transitory computer-readable medium storing aset of instructions for wireless communication, the set of instructionscomprising: one or more instructions that, when executed by one or moreprocessors of a user equipment (UE), cause the UE to: receive a downlinkcontrol information (DCI) message that includes a frequency domainresource allocation (FDRA) field to indicate allocated resource blocks(RBs) across multiple transmission configuration indication (TCI)states; identify, based at least in part on the DCI message and a higherlayer parameter being set to dynamic, a physical RB (PRB) bundle sizeparameter; identify, based at least in part on the PRB bundle sizeparameter, a precoding RB group (PRG) size parameter that indicates aunit of contiguous RBs over which a same precoding is used; divide theallocated RBs into n sets that include an equal quantity of theallocated RBs based at least in part on the allocated RBs beingcontiguous and the PRG size parameter indicating wideband, wherein n isa quantity of individual TCI states among the multiple TCI states; andassign each of the n sets to a respective one of the individual TCIstates.
 14. The non-transitory computer-readable medium of claim 13,wherein a first set of PRGs or a first set of PRBs are assigned to afirst TCI state and a second set of PRGs or a second set of PRBs areassigned to a second TCI state.
 15. The non-transitory computer-readablemedium of claim 13, wherein the unit of contiguous RBs with the sameprecoding is wideband per TCI state for a frequency divisionmultiplexing (FDM) scheme with the multiple TCI states.
 16. Thenon-transitory computer-readable medium of claim 13, wherein the one ormore instructions further cause the UE to: determine that the allocatedRBs are not contiguous, that the allocated RBs include n contiguousparts, and that the unit of contiguous RBs over which the same precodingis used is wideband; and assign, based at least in part on the allocatedRBs not being contiguous, the allocated RBs including the n contiguousparts, and the unit of contiguous RBs over which the same precoding isused being wideband, each of the n contiguous parts to a respective oneof the individual TCI states.
 17. The non-transitory computer-readablemedium of claim 13, wherein the allocated RBs include allocated PRGsthat are assigned to the individual TCI states according to a schemethat is determined based at least in part on the higher layer parameterbeing set to dynamic and the unit of contiguous RBs over which the sameprecoding is used being a value other than wideband.
 18. Thenon-transitory computer-readable medium of claim 17, wherein the schemeincludes an index being assigned to each individual PRG among theallocated PRGs based at least in part on an indication in the FDRAfield, and wherein the index assigned to each individual PRG is mappedto a respective one of the individual TCI states according to a functionthat is based at least in part on a quantity of the individual TCIstates.
 19. The non-transitory computer-readable medium of claim 18,wherein the function causes a first set of PRGs, that are assigned evenindices, to be mapped to a first TCI state and causes a second set ofPRGs, that are assigned odd indices, to be mapped to a second TCI statewhen the quantity of the individual TCI states is two.
 20. An apparatusfor wireless communication, comprising: means for receiving a downlinkcontrol information (DCI) message that includes a frequency domainresource allocation (FDRA) field to indicate allocated resource blocks(RBs) across multiple transmission configuration indication (TCI)states; means for identifying, based at least in part on the DCI messageand a higher layer parameter being set to dynamic, a physical RB (PRB)bundle size parameter; means for identifying, based at least in part onthe PRB bundle size parameter, a precoding RB group (PRG) size parameterthat indicates a unit of contiguous RBs over which a same precoding isused; means for dividing the allocated RBs into n sets that include anequal quantity of the allocated RBs based at least in part on theallocated RBs being contiguous and is the PRG size parameter indicatingwideband, wherein n is a quantity of individual TCI states among themultiple TCI states; and means for assigning each of the n sets to arespective one of the individual TCI states.